Date: Thu, 12 Apr 2018 23:52:13 +0200 From: =?UTF-8?Q?Niels_Kobsch=c3=a4tzki?= <niels@kobschaetzki.net> To: freebsd-net@freebsd.org Subject: High rate of NFS cache misses after upgrading from 10.3-prerelease to 11.1-release Message-ID: <ce3712c0-626e-c8f2-3bba-933cf359bcef@kobschaetzki.net>
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Hi, sorry for the cross-posting but so far I had no real luck on the forum or on question, thus I want to try my luck here as well. I upgraded a machine from 10.3-Prerelease (custom kernel with tcp_fastopen added) to 11.1-Release (standard kernel) with freebsd-update. I have two other machines that are still on 10.3-Prerelease. Those machines mount an NFS-export from a Linux-NFS-server and use NFSv3. The machine that got upgraded shows now far more cache misses for getattr than on the 10.3-machines (we talk a factor of 100) in munin. munin also shows a lot more cache-misses for other metrics like biow, biorl, biod (where can I find what those metrics mean=E2=80=A6currently I have not even an understanding what thes= e are) etc.=C2=A0 Can anybody help me how I can debug this problem or has an idea what could cause the problem? The result of this behavior is that this machine shows a lower performance than the others and I cannot upgrade other machines before I didn't fix this bug. Thanks, Niels
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